n. The amount that can be loaded into the buttocks while causing minimal discomfort. This measurement is not constant but varies depending on the individual. Related factors include rectal diameter, anal elasticity, and cheek-to-hole ratio.

Susie's rear was in pain the next day after taking a full butt-load the previous night.

A term used to define a finite sum of something. Generally accepted as an amount somewhere between a lot and a shit-ton. Often noted when speaking in hyperboly and used for extreme emphasis or exaggeration.